0=7a-21

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Solution for 0=7a-21 equation: 



0=7a-21

We move all terms to the left:

0-(7a-21)=0

We add all the numbers together, and all the variables

-(7a-21)=0

We get rid of parentheses

-7a+21=0

We move all terms containing a to the left, all other terms to the right

-7a=-21

a=-21/-7

a=+3

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